MESON Chess Problem Database

Problem Display
PID: 24376 (8/8/8/4Qp1n/6k1/5N2/5K2/8 w - - 0 1)

Nadezhdin, Nikolai Dmitrievich

Nachodninski Raboci, 1969

8/8/8/4Qp1n/6k1/5N2/5K2/8

#2

3 + 3

3295 Einfuhrung in die Welt des Schachproblem 1984
3296 Shakhmatny zadachi miniaturi 1987
3813 300 Sachmatu Uzdaviniu 1991
56 The Problemist 2006
5454 Near Snap 2007
3713 Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kh3
      • 2.Qxf5#
    • 1...f4
      • 2.Qe6#
  • Tries
    • 1.Qd4+?
      • 1...Kh3
        • 2.Qh4#
      • 1...f4
        • 2.Qd7#
      • 1...Sf4!
    • 1.Qf6?
      • threat
        • 2.Qh4#
      • 1...Kh3
        • 2.Qh4#
        • 2.Qxf5#
      • 1...Kf4
        • 2.Qd4#
        • 2.Qh4#
      • 1...f4
        • 2.Qe6#
      • 1...Sxf6!
    • 1.Qg7+?
      • 1...Kh3
        • 2.Qg2#
      • 1...Kf4
        • 2.Qd4#
      • 1...Sxg7!
    • 1.Qe7?
      • threat
        • 2.Qh4#
      • 1...Kh3
        • 2.Qh4#
      • 1...Kf4
        • 2.Qb4#
        • 2.Qh4#
      • 1...f4
        • 2.Qe6#
        • 2.Qd7#
      • 1...Sf6!
  • Keys
    • 1.Qh8!
      • 1...Kh3
        • 2.Qxh5#
      • 1...Kf4
        • 2.Qd4#
      • 1...Sg3
        • 2.Qh4#
      • 1...Sf4
        • 2.Qh4#
      • 1...Sf6
        • 2.Qh4#
      • 1...Sg7
        • 2.Qh4#
      • 1...f4
        • 2.Qc8#

This anticipates 247879(1991), 55555(1992)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAB(C),XP(b)
    • P(b);OGATEB,SBLOCK::QAB(C)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(C)
        • P(b);OGATEB,P_SPINP(b),SBLOCK::QAB(C)
      • Refutation
        • S(c);P_SPINS(c)
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • P(b);OGATEB,SBLOCK::QAB(C)
      • Refutation
        • S(c);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAB1(C)
        • K(a);P-FLIGHT::QAR2(C)
      • Refutation
        • S(c);XQ(C)
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);S_FLIGHT::QAR1(C)
      • Refutation
        • S(c);
  • Actual
    • Q(C);
    • Vars
      • K(a);P_SPINS(c),S_FLIGHT::QAR2(C),XS(c)
      • K(a);P-FLIGHT::QAR2(C)
      • S(c);OGATE::QAR1(C)
      • S(c);OGATE,SBLOCK::QAR1(C)
      • P(b);OGATEB,SBLOCK::QAB(C)
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